I tend to be a SoCal beach diver, recently returning to the sport. My original setup was an Oceanic/Aeris hoseless air integrated (Aeris 750GT) that logged a couple hundred dives without any real issue and self-replaceable batteries, but I'm not even sure I could find the right o-rings for the battery compartment even if I wanted to (aside from ones on eBay that have been sitting for 20 years). I had it on a retractor with compass and loved having everything in one place, and am looking to get an approximate modern replication. FWIW, I don't see myself getting into tech diving.
I "guess" that the old Aeris transmitter might work with the Shearwater since it has an MH8A marking, but I'm going to modernize everything.